^๐^.. I Love Electronics ..^๐^
This is a single zone alarm - with independently adjustable Exit, Entry and Siren Cut-Off timers. It will accommodate the usual types of normally-closed input devices - such as magnetic-reed contacts, foil tape and PIRs.
When the alarm is activated - the Siren will sound for up to 20-minutes. Then it will switch off - and [...]
This is a Li-Po charger and balancer project for R/C hobby.The charger circuit is based on the circuit of Electron head and all folks in the DIY electronics topic on the rcgroups.com.
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iPOD - MP3 Player Charger with MC34063A
lead acid battery Charger 6V -12V By 555 and LM340
Atmel Solar Panel Battery Charger
This battery charger charges a NIMH 5-pack battery used in the BiPed robot in less than 1 hour, and charges the 10-pack NiCd used in the Snuf robot in about 30 minutes. To prevent overheating of the battery, the charging current is turned off when the slope of the battery-voltage turns from positive into negative. [...]
